Patent GB-231822-A (GB)
Title: Improvements in tools for applying wire strap seals
IPC: B65B13/34
Filed: 1924-10-20
Abstract: 231,822. Griplock, Inc., (Assignees of Lurcott, W. N.). April 7, 1924, [Convention date]. Sealing.-A tool for fastening the ends of wire straps of the kind described in Specification 184,011, in which an open helix is formed from, and surrounds one end of the strap, the helix forming an open passage through which the other end of the strap is passed, comprises means for flattening the helix and crimping the parts of the wire enclosed therein, means for gripping the wire and for locking and releasing the grippers, and means for drawing the wire through the helix. The helix B, Fig. 2, with the free end A of the wire passed therethrough is placed under a hammer 15 on a table 16 faced with hardened plates, stops on the hammer casing 49 serving to position the helix. An apron 19, provided with an inclined portion, is lifted by and is carried over the end of the wire to position it in line with a cutter 22, Fig. 6, mounted in the hammer and extending into an aperture 60 in the table. The free end of the wire is placed in a hook 23 and lifted to the position shown in Fig. 2. The end of the wire carrying the helix is placed between a jaw 17, which carries the hook 23, and a bed 18 which co-operate to hold the wire during the tensioning process. A lever 32, pivoting on a spindle 33, is then rotated in a counterclockwise direction, and, at the end of its stroke, a tooth 36 thereon engages a block 37, Fig. 5, carrying a trigger 38 which is thus moved into engagement with a flattened portion on a link 29. The link is rotated against the action of a spring 28 to withdraw an arm 24 carrying the jaw 17 to cause it to grip the wire against the bed 18. At the same time, the movement of the hook 23 carries the free end of the wire between a number of pintles 25, Figs. 2 and 6, arranged around the surface of a disc 26 rotatable on the spindle 33. The lever 32 is then returned to its original position, and during its movement, a pawl 34 carried thereby rotates the disc 26. The wire is engaged by a deflecter 27 and is bent round the pintles so that on continued rotation of the disc it is drawn tightly round the package. Backward rotation of the disc is prevented by a pawl 35. Two levers 42, 43, operatively connected by geared ends 41, 44, Fig. 4, are then rotated to depress the hammer. The levers are mounted on shafts 45 provided with reduced eccentric portions 46, Fig. 6. Links 47 having curved ends to form saddles for the parts 46 and for rollers 48, convey the movement to the hammer. The movement of the levers effects the severing of the free end of the wire by the cutter 22, and the flattening of the helix. Near the end of the movement of the lever 42, a lug 40 strikes against an extension 57, Figs. 4 and 5, on a saddle 58 carrying a bar 59 which is connected to the block 37. The trigger 38 is therefore moved out of engagement with the link 29, and the spring 28 causes the jaw 17 to open and release the end of the wire. An auxiliary bed 18<a>, Fig. 6, having an inclined under surface, and adapted to be attached to the bed 18, and an auxiliary jaw corresponding thereto are provided to enable the device to be used on a curved or irregularly-shaped package.